My site does not show header colors on certain browsers

Please see the attached images. The first one shows my client's website as it is being loaded from my local computer. Notice that there is a purple background to the header menu. This is how the site is supposed to load. On my client's computers, however, the purple background is not visible. Instead, there is a transparent background. What do I need to do to make the purple menu bar appear on ALL browsers?

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